反应详情

温度

0 °C

To a solution of 3-Bromo-6-hydroxy-2-methyl-benzaldehyde (6.8 g, 0.032 mol)) in anhydrous DMF (50 ml) was added potassium carbonate (13.1 g, 0.095 mol) and cooled to 0° C. Bromo ethyl acetate (7.1 ml, 0.063 mol) was added slowly. The reaction mixture was stirred for one hour at 0° C. The completion of the reaction was confirmed by TLC. The reaction mixture was then heated to 100° C. and maintained for 2 hours. After cooling to room temperature, ice water (250 ml) was added and the mixture was stirred for 20 minutes. The solid separated was filtered, washed with water (100 ml) and dried under vacuum, to get crude product. Column chromatography using 2/5 ethyl acetate/hexane yielded 5-Bromo-4-methyl-benzofuran-2-carboxylic acid ethyl ester (6.2 g, 69.6%)

1. temperatureThe reaction mixture was then heated to 100° C.
2. temperaturemaintained for 2 hours
3. temperatureAfter cooling to room temperature
4. stirringthe mixture was stirred for 20 minutes
5. customThe solid separated
6. filtrationwas filtered
7. washwashed with water (100 ml)
8. customdried under vacuum
9. customto get crude product